Small Bore,
Reference Burrard,The Modern Shotgun Volume 3,The Gun and Cartridge, pages 375-378,[deals with obstructions and bulges near the muzzle.]
Quote:"Ring bulges near the muzzle are usually caused by some form of obstruction in the bore.They normally occur between .75 and 1.25 inches from the location of the obstruction. Position of the choke [acting as a restriction] and the wave pressure generated by the charge fired are also important factors in the location and forming of ring bulges."
A pertinent question for the Proof House:might well be;
"Dose the Proof house test proceedure require the barrels to be cleaned and viewed prior to and after the first proof test; so as to ensure that there are no fragments of the first charge remaining and/or permanent deformation of in the barrel, prior to the second proof test? If this proceedure is not in place[and strictly adhered] to,the possibility of fragments of the first charge remaining in the barrel exists and could result in formation of a ring bulges.
Last edited by Roy Hebbes; 02/23/11 08:52 AM.
